How well do chickens handle heat? I am asking because it’s getting warmer and warmer in my area as each day goes by. I want to make sure it’s cool enough inside the coop.
I usually don't have to worry about excessive heat where I live. Ventilation is key to just about everything. To keep the coop cooler, have a vent(s) open low to the floor and another vent(s) up high. This should naturally create a current where the cool air comes in the lower vent and hot air escapes from the vents above.
If outside, make sure they have some shade to sit under to keep cool. I have seen some people in hot climates put up shade cloth over their coop. I obviously don't have any need for that where I live.